[llvm-dev] [RFC] Python 2 / Python 3 status, final step(s)

[David Blaikie via llvm-dev]

*thumbs up*

Re: out of date buildbots: maybe stage the shebang changes in a time/way
that's easy to rollback (or even intended to rollback after a small time
window (few hours) off-peak) to flush out the buildbots. Then after that
rollout, go over the buildbot failures and follow-up with buildbot owners
to get them cleaned up before a more intended-to-stick rollout is done.

On Tue, Oct 13, 2020 at 7:18 AM James Y Knight via llvm-dev <
llvm-dev at lists.llvm.org> wrote:

> Yay, thanks for persevering with this migration!
>
> On Tue, Oct 13, 2020 at 8:04 AM Serge Guelton via llvm-dev <
> llvm-dev at lists.llvm.org> wrote:
>
>> Hi Folks,
>>
>> Now that LLVM 11.0.0 has been released, it's time to prepare for the
>> final step
>> envisionned in the previous RFC named *[RFC] Python 2 / Python 3 status*
>> [0],
>> ie. requiring Python3.6 for LLVM 12.0.0, to be released in 2021.
>> At least Fedora already only ships Python3 and we didn't have much bugs
>> reported
>> wrt. Python compatibility for the LLVM toolchain.
>>
>> Indeed, all Python scripts should now be at least compatible with both
>> python2 (py2)
>> and python3 (py3), some of them already are already py3 only.
>>
>> The build system still depends on Python in a few place, but it explicitly
>> mentions Python3_EXECUTABLE, and the main dependency (llvm-build) is
>> currently
>> being removed  in D89142.
>>
>> The shebangs have already been harmonized in D83857: some mention
>> /usr/bin/env
>> python, some mention /usr/bin/env python3, and none mention python2
>> anymore. It
>> would be great to have all script use the same shebang, PEP394 [1] makes
>> it
>> (relatively) clear that in our case, explicitly requiring python3 is the
>> way to
>> go.
>>
>> So basically, next step would be to update the documentation, remove the
>> Python2
>> fallback in root CMakeLists.txt and update shebangs.
>>
>> Anyone seeing an issue with that approach? I'm still a bit worried about
>> buildbots still running on py2 (?)
>>
>> Serge
>>
>> [0] http://lists.llvm.org/pipermail/llvm-dev/2020-January/138730.html
>> [1] https://www.python.org/dev/peps/pep-0394/
>>
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